This is the Google map image for walking directions from Westminster Abbey to St James Park Tube Station.
Note that the time and distance are specified.

These are the detailed directions for the above walk if required.

Clicking on the border between Scotland and England locates a point on the map.
Right clicking on a computer gives a menu where selection of What's here? gives the map coordinates.

The map coordinates from above can be recorded and entered to a Sat Nav for driving directions.
It is also possible to send the map coordinates to any of your connected devices using send to phone.
This will open the same point on Google maps on the device that the reference was sent.

This image is for driving directions, traffic indications and travel time from London Heathrow to Oxford.

Google Street View also allows views of a location to familiarise with location of entrances.

Internet Searches

Search ‘what to see in… ‘, ‘where to eat in…” for recommendations and reviews of other travellers

Search for public transport options, airport transfers

Search for tourist passes and alternatives providing transport and entry to sights

Example, in Paris there are multiple choices:

Paris Pass

Paris Museum Pass

Paris Visite (all day rail/metro ticket)

Carnet of metro tickets (a pack of 10 one-trip metro tickets)

What works for you will depend on what you want to see

Search for local tour options

City walks

Ghost tour

Bus tours

Private tours

Location Based Apps

There are many apps that provide detailed information of a particular location.